null ptr fix #23
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null ptr fix #23
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When looking up the map of active files, the returned value is a a `nullptr` if the file-open is ongoing. Check for this case and only try to use the file object if it is non-null. Without this check, the XrdPfc module will trigger a segfault when trying to increase the reference count for a null object. The places affected by the nullptr already have appropriate fallback code in place if the filename isn't on the active list at all -- we now use that code instead of crashing.
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